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Originally Posted by ixfxi
Typically a thermoplastic, polypropylene or polyurethane....... or a blend of it.
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which at the end of the day is NOT a pure polyurethane. front bumpers and lips consist of blends of materials (not just polyurethane). OEM bumpers are much more flexible than standard side skirts and valances yes, however, they dont suffer the same type of problems from exposure to heat like pure polyurethane parts are prone to.
HOWEVER, the factory S13 kouki lip IS pure ABS plastic. the lip i molded my urethane replica from was brand new out of the box. it was amazingly thin and it was very understandable why they broke/shattered so easily versus the OEM 180sx zenki lips (and even the OEM 180sx chuki lip).
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FRP sucks because its fragile, hard, and when painted - easy to chip. Plus, having them painted is also a ton of work. But hey, its a low-buck solution to replicating these aero parts - I get it. The way I see it though, OEM or bust.
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unfortunately, your response seems quite weighted in personal opinion. FRP parts are easily prepped for paint when produced properly (my parts only require scuffing with 400 grit sand paper before primer). FRP is far from fragile when made properly (again). if the part is flexible and can absorb impact, this helps prevent cracking and shattering versus parts that are primarily made using filler in their resins (a cheap way to save money on parts production). OEM parts are nice and all, but "OEM or bust" is a response showing more personal opinion versus fact. OEM plastics are nice and all, but when they break... they are a pain to repair. side skirts and valances crack and break very easily, especially with how old the plastics are now. MOST of the used OEM aero parts left on the market now are dried out, sun damaged and brittle. in turn, this makes the parts easy to break... in some cases, even easier than your claim against FRP based parts.